Table 1.

Technical characteristics of the Aranet 4 Pro meters.

Parameters measured	CO2	<9999 ppm
	Temperature	0–50 °C
	Relative humidity	0–85%
	Atmospheric pressure	0.3–1.1 atm
Sensor type	N-DIR (Non-Dispersive Infrarred)
Communication technology	Bluetooth (−12–4 dBm)
Sampling frequency	1 min
Precision	±50 ppm (CO2)
Dimensions/Weight	70 × 70 × 24 mm/104 g